Patent US3344115A successfully refreshed from Google Patents.
US3344115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical brightening of a polyester by incorporating 2, 5-dimethoxy terephthalic acidtherein
Assignee: Glanzstoff AG
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Filing: 1963-11-13
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Granted: 1967-09-26
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Expires: 1983-11-13
Abstract
No abstract record available.
Inventors
- 👤 Rein Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:21
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
AN OPTICALLY BRIGHTENED LINEAR FIBER-FORMING POLYESTER OF THE COMPONENTS CONSISTING ESSENTIALLY OF (A) A MONOMERIC REACTANT SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID, ISOPHTHALIC ACID, NAPHTHALENE-1,4-DICARBOXYLIC ACID, NAPHTHALENE-1,6DICARBOXYLIC ACID AND THEIR LOWER ALKYL ESTERS, (B) A GLYCOL, AND (C) AS AN OPTICAL BRIGHTENER, FROM ABOUT 0.01 UP TO 5% BY WEIGHT, WITH REFERENCE TO THE POLYESTER, OF A MONOMERIC REACTANT SELECTED FROM THE GROUP CONSISTING OF 2,5-DIMETHOXY-TEREPHTHALIC ACID AND ITS LOWER ALKYL ESTERS.
Claim 2
Dependent Claim
74 words
AN OPTICALLY BRIGHTENED LINEAR FIBER-FORMING POLYESTER OF THE COMPONENTS CONSISTING ESSENTIALLY OF (A) A MONOMERIC REACTANT SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID, ISOPHTHALIC ACID, NAPHTHALENE-1,4-DICARBOXYLIC ACID, NAPHTHALENE-1,6DICARBOXYLIC ACID AND THEIR LOWER ALKYL ESTERS, (B) A GLYCOL, AND (C) AS AN OPTICAL BRIGHTENER, FROM ABOUT 0.01 UP TO 5% BY WEIGHT, WITH REFERENCE TO THE POLYESTER, OF A MONOMERIC REACTANT SELECTED FROM THE GROUP CONSISTING OF 2,5-DIMETHOXY-TEREPHTHALIC ACID AND ITS LOWER ALKYL ESTERS.
References Cited (Backward Citations)
US2894934A
Cited
US2902469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |